Thank You Day in Japan
Thank You Day in Japan is held on March 9. Arigato No Hi. This event in the first decade of the month March is annual. 
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Call it the Japanese Thanksgiving. The numbers three and nine are in this case read as “sankyu,” the Katakana version of “thank you.”
Similar holidays and events, festivals and interesting facts
Escalators Day in Japan on March 8
Hote Matsuri on March 10 (Shiogama, Japan);
Kasuga Matsuri on March 13 (Kasuga Grand Shrine, Nara, Japan);
White Day in Japan on March 14 (also South Korea, Vietnam, Taiwan, Hong Kong, Malaysia and China on March 14, one month after Valentine's Day - ホワイトデ);
Hōnen Matsuri in Japan on March 15 (豊年祭, "Harvest Festival" is a fertility festival celebrated every year on March 15 in Japan. Hōnen means prosperous year in Japanese, implying a rich harvest, while a matsuri is a festival);
Minion Day in Japan on March 20
Vernal Equinox Day in Japan on March 21 (it’s a public holiday, and a time for traditions and an appreciation of the world at large)